Best available cop



Sept. 18, 1928. 1,684,650

G. H..1'UTTLE TAP CHANGER Filled June 2. 1927 posite pa'ifr's'io'f contacts 3ft-'are arrangedto be connected by a'brush1 35 which I" prefer to form et a series of laminated met-al strips drawn -intoarcirate-form as show-n by means vof Castings 36 and 37 which are secured to the brush by astenings 38 or the like. The upper casting 36 has a socket 39 in whichis reto the rod ini thesame way' that casting 39, is

securedl to :rod-*28.-A Cooperating" witlv the casting 42`^is 'a casting 43 twith an integral' stemonrd 441.-Afzbrush45 is formed int-o arcuate shape like the brush by bein'g'co'inpressed-betwe'enthe castings 42fand :43 and held'ftl'us 'by means o astenings 46. vAngular contact;l plates`47'siniilar to Aplates 341 are mounted on the ftiibef17 'i'np'osition to be contactedbyl the brush-E', the plates 47 being adapted to be connected to :other 4taps of the transformer. The lower end of the s tem44 slides-in 'a-hole'pr'ovi'ded in' the center of an insulating,r disk 48 mou'ntcdsirnila'rly to disk 324by'ineans of ib'erbolts 4 9'. V

In Fig'. '1ct the-drawings, the-,parts are sliownl in `their normaloperative positions. When' it becomes desirable t'change the taps oftheitransformen'the operator removes the studs 1 5, vlifts off the cover 13, grasps the handle '27 and lifts it up suliiciently against the action of the sprinfg`31'to enable, the lug 26 to clear the lugs 23 and 24, thus raising brushes '3 5 and 45,' away `from Ytheir cont-act. plates '34` 'and 47. :The' operator then Aturns the handle 27 tothe position desired and permits spring 31 to `force the movable parts down until the lug 26 is seated in the desired socket 25' and the brushes' and45 are accordingly caused to bridge different pairs of contactsv 34 and 47. Now when the cover 1? is replaced and locked 'down by the studs 15, it meets or substantiallymeets the top of the handle 27. By this means rods 28, 41 and 44 'andthe brushes 35 and 45-are'held down, so that any surges on the'line to which the transformer is connectcd'will not disengage the brushes 35 and 45 from the plates with which they are in cont-act.

Furthermore, if the operator should fail to properly set the tap changer as` forinstance, when the lug 26 rested on the sector 23Jor one of the lugs 24, instead of enteringr one of the sockets 25, then' he would be unable to replace the cover 13, and hence the failure to properly set the tap changer would be called to his attention.

Having thus described my invention, what 1 claim is: y

l. In a transformer` atank having'an opening therein, a removable cover adapted to be secured thereto, antube-jo'f insulatingmaterial supported "within said tank, a 'plurality of contacts mounted on the inside of said tube, an axially movable endg-rotatable rod-ary ranged within-said-tube,fa. brush carried by said rod and arranged to engage said contants, a handle secured to said rod, cooperatingr means carried by said tube and said handle wit-hin the tank for locating,r said brush in its different positions, said coverwhen in closed position being adaptedto -holdlsaidod against axial movement.A 'E

2. In a transformer,'atank having an open.- ing therein, a remoi'fablecover adapted'tbe secured to lthe t-anlQ-a4 tap changerfvvithin the tank comprising-an axiallymovablerod, and means :associated with the rd Aandadapt: ed to be engagedby said cover' 'whenin'closed position for holding-saidA rod-against axial loveme-nt 1: J i. 3. I .n a transformer@ tank having ain-opening therein,- rer'tioi'fableieoven adapted? to be secured thereto, a' 'tube-'of inslilatin'g'material supported within saidita'nk inialignm'eintwith said opening, a' plurality. o'f contacts mounted on the inside of said`I tube, an airially'r' movable and rotatable rodarranged within said tube, a brush 'carriedby saidrodandarran'ged to engage said contactsQafc-ap ls'ecu'r'ed '-to'said tubewithin the tank, and c bpetingineans carried'by said cap and said "rodi fo'rlo'cat-ing said brush in itsditfejrerit positions", said cover when in its closed position'beirig 'adapt-f ed to hold said rod againstaxial movement.

4. In a transfoinier,-a.tank'having anopen ing therein, a' removable 'cove'r'adaptedlto' be secured tothe tank't clo'se'saidopening, a

tap changervwithin the' tankcom'prising an axially movable and 'rotatable rd, and 'a handle for said rod, said cover when' in closed position being adapted to engage with said handle and hold `the rod against axial movement.

In a transtorn'ier, a tank having an openin er therein, a removable cover adapted to be .secured to the tank to close saidfopen'ing, a

tan changer within the tankcomprising an axially movable and rotatable rod,means for holding' said rod in adjusted positions against rotative movement,- and means associated with the rod and' adapted to be engagedv by said cover when iu closed position' for holdinfr .sz-iid rodagainst axial movement.

6. In a transformer. a tank havingr an'openin;` tlnrein` a removable cover adapted to be secured to the tank to close said opening, a tap changer within the tank comprising an axially movable and rotatable rod, means for holding' said rod in adjusted positions against rotative increment-. and a handle for said rod, said cover when in closed position being adapted to engage said handle to hold the rod against axial movement.

7. In atranstormer, a tank` a tap changer located wholly within the tank and comprising an axially movable and rotatable rod, means for releasably holding the said rod in various positions of adjustment, a handle for the rod Within said tank, said tank having an opening through which said handle may be reached, and a cover for said opening.

8. In a transformer, a tank having an opening therein, a removable cover adapted to be secured to the tank, a tap changer Within the tank comprising a movable rod, and means associated with the rod adapted to be engaged by said cover when in closed position for holding said rod against movement.

9. In a transformer, a tank having an opening therein, a removable cover adapted to be secured to the tank, a tap changer Within the tank comprising a rotatable rod accessible for operation through said opening, means for securing the cover in closed position, and

means entirely within the tank for holding said rod against rotary movement.

In testimony whereof, I hereunto aflix my signature.

GEORGE H. TUTTLE. 

